[Tile-serving] [openstreetmap/osm2pgsql] Add docs about using `create_only` columns for postprocessed data (#1233)

[Jochen Topf]

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1233

-- Commit Summary --

  * Add docs about using `create_only` columns for postprocessed data

-- File Changes --

    M docs/flex-advanced-topics.md (31)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1233.patch
https://github.com/openstreetmap/osm2pgsql/pull/1233.diff

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